Hosted by Ben Shephard, Rochelle Humes and Chris ‘Kammy’ Kamara, series four will see another batch of hopeful competitors push themselves to their limits as they try to complete the ultimate challenge.

Featuring extraordinary people from around the UK who will share with viewers what they pledge to change in their life by ‘This Time Next Year’. Over the course of 12 months they’ll aim to fulfil their dreams of losing weight, meeting an unknown family member, having children, or finally realising a lifelong personal ambition.